/*
 * Copyright 2017 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.buffer;

import io.netty.util.internal.StringUtil;

import java.util.List;

/**
 * Exposed metric for {@link PooledByteBufAllocator}.
 */
@SuppressWarnings("deprecation")
public final class PooledByteBufAllocatorMetric implements ByteBufAllocatorMetric {

  private final PooledByteBufAllocator allocator;

  PooledByteBufAllocatorMetric(PooledByteBufAllocator allocator) {
    this.allocator = allocator;
  }

  /**
   * Return the number of heap arenas.
   */
  public int numHeapArenas() {
    return allocator.numHeapArenas();
  }

  /**
   * Return the number of direct arenas.
   */
  public int numDirectArenas() {
    return allocator.numDirectArenas();
  }

  /**
   * Return a {@link List} of all heap {@link PoolArenaMetric}s that are provided by this pool.
   */
  public List<PoolArenaMetric> heapArenas() {
    return allocator.heapArenas();
  }

  /**
   * Return a {@link List} of all direct {@link PoolArenaMetric}s that are provided by this pool.
   */
  public List<PoolArenaMetric> directArenas() {
    return allocator.directArenas();
  }

  /**
   * Return the number of thread local caches used by this {@link PooledByteBufAllocator}.
   */
  public int numThreadLocalCaches() {
    return allocator.numThreadLocalCaches();
  }

  /**
   * Return the size of the tiny cache.
   */
  public int tinyCacheSize() {
    return allocator.tinyCacheSize();
  }

  /**
   * Return the size of the small cache.
   */
  public int smallCacheSize() {
    return allocator.smallCacheSize();
  }

  /**
   * Return the size of the normal cache.
   */
  public int normalCacheSize() {
    return allocator.normalCacheSize();
  }

  /**
   * Return the chunk size for an arena.
   */
  public int chunkSize() {
    return allocator.chunkSize();
  }

  @Override
  public long usedHeapMemory() {
    return allocator.usedHeapMemory();
  }

  @Override
  public long usedDirectMemory() {
    return allocator.usedDirectMemory();
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder(256);
    sb.append(StringUtil.simpleClassName(this))
        .append("(usedHeapMemory: ").append(usedHeapMemory())
        .append("; usedDirectMemory: ").append(usedDirectMemory())
        .append("; numHeapArenas: ").append(numHeapArenas())
        .append("; numDirectArenas: ").append(numDirectArenas())
        .append("; tinyCacheSize: ").append(tinyCacheSize())
        .append("; smallCacheSize: ").append(smallCacheSize())
        .append("; normalCacheSize: ").append(normalCacheSize())
        .append("; numThreadLocalCaches: ").append(numThreadLocalCaches())
        .append("; chunkSize: ").append(chunkSize()).append(')');
    return sb.toString();
  }
}
